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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis of cyclic polyesters: effects of alkoxy side chains in salicylaldiminato tin(II) complexes
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Synthesis of cyclic polyesters: effects of alkoxy side chains in salicylaldiminato tin(II) complexes

机译:环状聚酯的合成:水杨基亚氨基锡(II)配合物中烷氧基侧链的影响

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摘要

A new class of salicylaldiminato tin(II) catalysts having different alkoxy side chains has been developed. The ligands were modified to have different lengths and flexibilities such as -(CH2)(2)- (2a), -(CH2)(3)- (2b), -(ortho-C6H4)CH2- (2c) and -(CH2)(2)-O-(CH2)(2)- (2d). Complexes 2a, b were characterized crystallographically revealing a more constrained environment around the metal in complex 2a. These catalysts are active for the solvent-free polymerization of L-lactide and e-caprolactone. Complex 2a having a shorter side chain was shown to better promote intramolecular transesterification affording cyclic polylactides and cyclic poly(epsilon-caprolactone). Complexes 2b and 2d having longer side chains produced cyclic poly-(epsilon-caprolactone) as a major product but failed to give cyclic polylactides.
机译:已经开发出具有不同烷氧基侧链的一类新的水杨基亚氨基锡(II)催化剂。修饰配体以具有不同的长度和柔性,例如-(CH2)(2)-(2a),-(CH2)(3)-(2b),-(邻-C6H4)CH2-(2c)和-( CH2)(2)-O-(CH2)(2)-(2d)。配合物2a,b的结晶学特征表明在配合物2a中金属周围的环境更受限制。这些催化剂对L-丙交酯和ε-己内酯的无溶剂聚合具有活性。已显示具有较短侧链的配合物2a可更好地促进分子内酯交换,从而提供环状聚丙交酯和环状聚(ε-己内酯)。具有较长侧链的配合物2b和2d产生了作为主要产物的环状聚(ε-己内酯),但是未能提供环状聚丙交酯。

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